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/*
* Serpent (SSE2)
* (C) 2009 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#include <botan/serp_sse2.h>
#include <botan/serp_sse2_sbox.h>
#include <botan/loadstor.h>
#include <emmintrin.h>
namespace Botan {
namespace {
#define rotate_left_m128(vec, rot) \
_mm_or_si128(_mm_slli_epi32(vec, rot), _mm_srli_epi32(vec, 32-rot))
#define key_xor(round, b0, b1, b2, b3) \
do { \
__m128i key = _mm_loadu_si128(keys + round); \
b0 = _mm_xor_si128(b0, _mm_shuffle_epi32(key, _MM_SHUFFLE(0,0,0,0))); \
b1 = _mm_xor_si128(b1, _mm_shuffle_epi32(key, _MM_SHUFFLE(1,1,1,1))); \
b2 = _mm_xor_si128(b2, _mm_shuffle_epi32(key, _MM_SHUFFLE(2,2,2,2))); \
b3 = _mm_xor_si128(b3, _mm_shuffle_epi32(key, _MM_SHUFFLE(3,3,3,3))); \
} while(0);
#define transform(b0, b1, b2, b3) \
do \
{ \
b0 = rotate_left_m128(b0, 13); \
b2 = rotate_left_m128(b2, 3); \
b1 = _mm_xor_si128(b1, _mm_xor_si128(b0, b2)); \
b3 = _mm_xor_si128(b3, _mm_xor_si128(b2, _mm_slli_epi32(b0, 3))); \
b1 = rotate_left_m128(b1, 1); \
b3 = rotate_left_m128(b3, 7); \
b0 = _mm_xor_si128(b0, _mm_xor_si128(b1, b3)); \
b2 = _mm_xor_si128(b2, _mm_xor_si128(b3, _mm_slli_epi32(b1, 7))); \
b0 = rotate_left_m128(b0, 5); \
b2 = rotate_left_m128(b2, 22); \
} while(0);
void print_simd(const char* name, __m128i vec)
{
union { __m128i v; int32_t ints[4]; } u = { vec };
printf("%s: ", name);
for(u32bit i = 0; i != 4; ++i)
printf("%08X ", u.ints[i]);
printf("\n");
}
void serpent_encrypt_4(const byte in[64],
byte out[64],
const u32bit keys_32[132])
{
const __m128i* keys = (const __m128i*)(keys_32);
/*
FIXME: figure out a fast way to do this with 4 loads with
_mm_loadu_si128 plus shuffle/interleave ops
*/
union { __m128i v; u32bit u32[4]; } convert;
convert.u32[0] = load_le<u32bit>(in, 0);
convert.u32[1] = load_le<u32bit>(in, 4);
convert.u32[2] = load_le<u32bit>(in, 8);
convert.u32[3] = load_le<u32bit>(in, 12);
__m128i B0 = convert.v;
convert.u32[0] = load_le<u32bit>(in, 1);
convert.u32[1] = load_le<u32bit>(in, 5);
convert.u32[2] = load_le<u32bit>(in, 9);
convert.u32[3] = load_le<u32bit>(in, 13);
__m128i B1 = convert.v;
convert.u32[0] = load_le<u32bit>(in, 2);
convert.u32[1] = load_le<u32bit>(in, 6);
convert.u32[2] = load_le<u32bit>(in, 10);
convert.u32[3] = load_le<u32bit>(in, 14);
__m128i B2 = convert.v;
convert.u32[0] = load_le<u32bit>(in, 3);
convert.u32[1] = load_le<u32bit>(in, 7);
convert.u32[2] = load_le<u32bit>(in, 11);
convert.u32[3] = load_le<u32bit>(in, 15);
__m128i B3 = convert.v;
key_xor(0,B0,B1,B2,B3); SBoxE1(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(1,B0,B1,B2,B3); SBoxE2(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(2,B0,B1,B2,B3); SBoxE3(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(3,B0,B1,B2,B3); SBoxE4(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(4,B0,B1,B2,B3); SBoxE5(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(5,B0,B1,B2,B3); SBoxE6(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(6,B0,B1,B2,B3); SBoxE7(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(7,B0,B1,B2,B3); SBoxE8(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor( 8,B0,B1,B2,B3); SBoxE1(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor( 9,B0,B1,B2,B3); SBoxE2(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(10,B0,B1,B2,B3); SBoxE3(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(11,B0,B1,B2,B3); SBoxE4(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(12,B0,B1,B2,B3); SBoxE5(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(13,B0,B1,B2,B3); SBoxE6(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(14,B0,B1,B2,B3); SBoxE7(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(15,B0,B1,B2,B3); SBoxE8(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(16,B0,B1,B2,B3); SBoxE1(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(17,B0,B1,B2,B3); SBoxE2(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(18,B0,B1,B2,B3); SBoxE3(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(19,B0,B1,B2,B3); SBoxE4(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(20,B0,B1,B2,B3); SBoxE5(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(21,B0,B1,B2,B3); SBoxE6(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(22,B0,B1,B2,B3); SBoxE7(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(23,B0,B1,B2,B3); SBoxE8(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(24,B0,B1,B2,B3); SBoxE1(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(25,B0,B1,B2,B3); SBoxE2(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(26,B0,B1,B2,B3); SBoxE3(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(27,B0,B1,B2,B3); SBoxE4(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(28,B0,B1,B2,B3); SBoxE5(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(29,B0,B1,B2,B3); SBoxE6(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(30,B0,B1,B2,B3); SBoxE7(B0,B1,B2,B3); transform(B0,B1,B2,B3);
key_xor(31,B0,B1,B2,B3); SBoxE8(B0,B1,B2,B3); key_xor(32,B0,B1,B2,B3);
// FIXME: figure out how to do this fast
union { __m128i v; u32bit u32[4]; } convert_B0;
union { __m128i v; u32bit u32[4]; } convert_B1;
union { __m128i v; u32bit u32[4]; } convert_B2;
union { __m128i v; u32bit u32[4]; } convert_B3;
convert_B0.v = B0;
convert_B1.v = B1;
convert_B2.v = B2;
convert_B3.v = B3;
store_le(out,
convert_B0.u32[0], convert_B1.u32[0],
convert_B2.u32[0], convert_B3.u32[0]);
store_le(out + 16,
convert_B0.u32[1], convert_B1.u32[1],
convert_B2.u32[1], convert_B3.u32[1]);
store_le(out + 32,
convert_B0.u32[2], convert_B1.u32[2],
convert_B2.u32[2], convert_B3.u32[2]);
store_le(out + 48,
convert_B0.u32[3], convert_B1.u32[3],
convert_B2.u32[3], convert_B3.u32[3]);
}
}
/*
* Serpent Encryption
*/
void Serpent_SSE2::encrypt_n(const byte in[], byte out[], u32bit blocks) const
{
while(blocks >= 4)
{
serpent_encrypt_4(in, out, this->round_key);
//Serpent::encrypt_n(in, out, 4);
in += 4 * BLOCK_SIZE;
out += 4 * BLOCK_SIZE;
blocks -= 4;
}
for(u32bit i = 0; i != blocks; ++i)
{
Serpent::encrypt_n(in, out, 1);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
/*
* Serpent Decryption
*/
void Serpent_SSE2::decrypt_n(const byte in[], byte out[], u32bit blocks) const
{
for(u32bit i = 0; i != blocks; ++i)
{
Serpent::decrypt_n(in, out, 1);
in += BLOCK_SIZE;
out += BLOCK_SIZE;
}
}
}
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